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Measurements near Bluff Bodies in Turbulent Boundary Layers Intended to Simulate Atmospheric Surface Layers.

AD782090

Publication Date	1974
Personal Author	Tan-Atichat, J.; Nagib, H. M.
Page Count	186
Abstract	A relatively new counter-jet technique is shown to be suitable for producing thick turbulent boundary layers which may be used to simulate neutral atmospheric surface layers in wind tunnels of moderate length. The increased thickness is achieved by providing large momentum defects at the wall through upstream-oriented, spanwise-discrete wall jets, with changeable jet velocities and controllable jet angles. This technique permits rapid alteration of reproducible boundary layers from outside the tunnel while the experiments are in progress. (Modified author abstract)
Keywords	Atmospheres Turbulent boundary layer Wind tunnel tests Simulation Flow fields Velocity Jet mixing Flow Shear properties Blunt bodies Layers Surface roughness Test methods NTISNSF Velocity profiles Atmospheric layers Wall jets
Source Agency	Air Force
NTIS Subject Category	46B - Fluid Mechanics
Corporate Authors	Illinois Inst of Tech Chicago Dept of Mechanics Mechanical and Aerospace Engineering
Document Type	Technical Report
Title Note	Interim rept.
NTIS Issue Number	197419
Contract Number	F44620-69-C-0022

Measurements near Bluff Bodies in Turbulent Boundary Layers Intended to Simulate Atmospheric Surface Layers.

Measurements near Bluff Bodies in Turbulent Boundary Layers Intended to Simulate Atmospheric Surface Layers.
AD782090

Publication Date	1974
Personal Author	Tan-Atichat, J.; Nagib, H. M.
Page Count	186
Abstract	A relatively new counter-jet technique is shown to be suitable for producing thick turbulent boundary layers which may be used to simulate neutral atmospheric surface layers in wind tunnels of moderate length. The increased thickness is achieved by providing large momentum defects at the wall through upstream-oriented, spanwise-discrete wall jets, with changeable jet velocities and controllable jet angles. This technique permits rapid alteration of reproducible boundary layers from outside the tunnel while the experiments are in progress. (Modified author abstract)
Keywords	Atmospheres Turbulent boundary layer Wind tunnel tests Simulation Flow fields Velocity Jet mixing Flow Shear properties Blunt bodies Layers Surface roughness Test methods NTISNSF Velocity profiles Atmospheric layers Wall jets
Source Agency	Air Force
NTIS Subject Category	46B - Fluid Mechanics
Corporate Authors	Illinois Inst of Tech Chicago Dept of Mechanics Mechanical and Aerospace Engineering
Document Type	Technical Report
Title Note	Interim rept.
NTIS Issue Number	197419
Contract Number	F44620-69-C-0022